AGH w Krakowie

Poland

AGH w Krakowie

Poland
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Influence of UV-chlorination sequence application on swimming pool water quality was investigated. In addition, an analysis of operating costs of such system was conducted. The study was based on a real facility, i.e. the swimming pool of AGH University of Science and Technology in Krakow. In the facility, water disinfection with calcium hypochlorite was carried out, assisted by UV irradiation. Switching the UV lamps temporarily off allowed for comparative studies on the quality of pool water disinfected by pure chlorination and by the UV and chlorination sequence. For these two variants of the swimming pool water disinfection several physico-chemical and microbiological parameters were analyzed, including the disinfection by-products. Cost analysis included the consumption of chemical agents and the UV lamp operation. It was established that the UV technology did not contribute to the expected improvement in the pool water quality in terms of the combined chlorine removal, however it did cause an increase in the concentration of selected organic chlorination by-products. Moreover, application of the UV lamp to the pool water treatment system increased the chlorine demand and, consequently, the consumption of calcium hypochlorite. Combined with the need to exchange lamp filaments, it raised the operating costs of the pool water treatment technology.


The paper investigates the possibility of replacing the traditional diesel generators by renewable hybrid energy sources utilizing the Sun and wind energy. Based on the formulated mathematical model an economic, environmental and reliability analysis has been conducted. The obtained results indicate that the hybrid energy source might have smaller environmental impact whilst satisfying the energy needs. © 2017, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.


Szurlej A.,AGH w Krakowie | Ruszel M.,Wydzial Zarzadzania | Olkuski T.,AGH w Krakowie
Rynek Energii | Year: 2015

The paper mainly tries to answer the title question. To this end, an analysis was carried out, showing the complex conditions of the domestic natural gas market and positive developments on this market. When comparing the dynamics of domestic gas market with a large majority of EU national markets in recent years, Poland's market holds a positive record. To assess the competitiveness of natural gas in the future, it was necessary to explain the most important relations on the LNG market, since in the coming years these supplies may largely decide upon the competitive advantage of gaseous fuels. Having in mind the dominant market share of imported gas supplies, particular attention was given to the geopolitical context of the natural gas market. Further in the paper, the costs of natural gas imports were analysed, including the imports of LNG to selected EU countries and Japan, as well as the prices of gaseous fuels for end customers (households and industrial customers). The paper closes with a summary that outlines the main conclusions.


The aim of this paper was the assessment of spatial and temporal complementarity of wind and solar resources based on selected locations in Poland. More specifically, we asked the following questions: a) does the spatial distribution of photovoltaic systems and wind farms own the property of smoothing the energy generation curve? b) is it possible as a result of renewable energy sources distribution over several locations to decrease instances of outliers in terms of energy production? c) to what extent depending on time step exists complementarity of sun and wind energy?. Conducted calculations were based on daily measurements of wind speed and insolation for the period 1984-2004 which were acquired from Institute of Meteorology and Water Management (IMGW) and www.soda-is.com. Obtained results are encouraging since the positive impact of spatial distribution on smoothing the energy generation curve was observed. From the power system point of view an expedient correlation between available wind and solar radiation in yearly time scale exists in analyzed locations. © 2017, Wydawnictwo SIGMA - N O T Sp. z o.o. All Rights Reserved.


Olkuski T.,AGH w Krakowie | Szurlej A.,AGH w Krakowie
Rynek Energii | Year: 2015

The paper attempts to characterize the gas market in Spain. Attention has been paid to limited production from own resources accompanied by high consumption of this raw material, which has shown an upward trend in the period from 1990 to 2008. Since the economic crisis, gas consumption decreases, but Spain still imports large quantities of gas from Algeria, Nigeria, Norway, Qatar and several other countries, mainly in liquefied form (LNG). Spain has six LNG receiving terminals (the highest number among EU countries); natural gas is then re-gasified and supplies the national network of gas pipelines only to be re-exported to other countries. Spain is the largest re-exporter of gas in the world and the Spanish Government is planning to increase exports so that the European Union countries will be partially independent from Russian gas supplies. However, increasing exports requires the construction of new gas connections with France, which is expensive and not welcomed by France fearing for its gas market destabilization in the case of influx of additional raw material from Spain. What is more, Spain is the European leader when it comes to LNG refueling stations and the use of liquefied natural gas to power vehicles. Gas for transportation purposes is used not only in the form of LNG but, above all, CNG, while the best example is Madrid. In Spain, natural gas is also used to produce electricity. However, renewable energy sources are becoming increasingly important in this sector. In 2013, renewable sources covered as much as 42.2% of the national demand for electricity.


Jurasz J.,AGH w Krakowie | Mikulik J.,AGH w Krakowie | Piasecki A.,Wydzial Zarzadzania
Przeglad Elektrotechniczny | Year: 2016

Climate change/variability is one of the factors that affects the pattern of electrical energy consumption. Where the temperature is perceived as dominant and of crucial role in demand forecasting. Conducted analysis shows that energy demand pattern in Poland is slowly changing, and the impact of warmer days becomes more distinguishable © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.


Flaga S.,AGH w Krakowie | Oprzedkiewicz I.,AGH w Krakowie | Sapinski B.,AGH w Krakowie
Solid State Phenomena | Year: 2013

Magnetic Shape Memory Alloys (MSMA) constitute one of the newest groups of intelligent materials [9]. Although these materials have yet to find commercial applications, literature with information on the first pre-prototype actuators can already be found. The mechanism of operation of these actuators is based on the magnetic shape memory effect. During tests, the shifting of piston and current in the coil of the electromagnet were measured. Measurements were synchronized with set courses of this current coil of the actuator. The obtained results made it possible to make static characteristics for constant levels of current, and dynamic curves for constant values of frequency as well as to construct a mathematical model. In this work, the authors have described laboratory tests of an experimental actuator of this type. © (2013) Trans Tech Publications, Switzerland.


The paper discuses the design of a wideband multiple antennas receiver dedicated for wireless data reception in neural recording systems. The presented receiver operates in 4 GHz frequency band. It makes use of a matrix of wideband antennas to support proper data reception in very wide carrier frequencies range, to increase transmission range and to enable localization of the transmitter. Received signals are decoded and demodulated using an FPGA programmable logic. © 2014 Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.


Jurasz J.,Katedra Inzynierii Zarzadzania | Mikulik J.,AGH w Krakowie
Przeglad Elektrotechniczny | Year: 2016

This paper presents a method for forecasting energy demand based on WT-ANN (Wavelet Transform – Artificial Neural Network). Model has been developed and assessed for system data for the period 2002-2014. As input variables following have been considered: five levels of signal decomposition (t-1, t-2), values of time series (t-1, t-2) and qualitative variables denoting day of the week. © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All Rights Reserved.


Naworyta W.,AGH w Krakowie
Prace Naukowe Instytutu Gornictwa Politechniki Wroclawskiej | Year: 2013

The sense of determining the direction of reclamation and the meaningful content of this term have been critically presented against the background of the law regulations and the mining practice. A review of reclamation directions and methods for choosing the appropriate reclamation of post-mining terrains has been conducted. The kinds of terrains after rock quarrying have been described together with their distinctive characteristics which have decisive influence on the choice of the reclamation direction. The most important conditionings for the choice of the kind of reclamation have been analysed, including economic, social and natural factors. The importance of cost optimisation of the reclamation venture have been highlighted together with the costs of infrastructure maintenance costs after the reclamation process is finished. The necessity for adjusting the reclamation process of the post-mining objects to their future functions has been justified while considering local conditions, including the demography. The difference between the social expectancies for a specific method of reclamation and the actual need resulting from the municipality's requirements has been distinguished. Critical reference to the reclamation practice in Polish rock quarrying has been made. Attention has been paid to insufficient use of the potential of the post-mining terrains and the necessity to change this situation for the improvement of the industry's public image in a social perception.

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